A special module is installed into a fire alarm panel that is supervised by the receiving equipment for "line fault", "common trouble", "supervisory" and "alarm". NAC: Short for "Notification Appliance Circuit". Also called the Bell Circuit, Signal Circuit, or Output Circuit.
What is a NAC module?
Advanced Intelligent NAC Module is an addressable module for use with the AxisAX Series Intelligent Fire Alarm Control Panel's SLC Loops. ... Each module also supervises the wiring for opens, shorts and grounds and reports this status back to the intelligent fire alarm control panel.
How does a NAC panel work?
The panel uses continuity to supervise the wires of the Notification Appliance Circuit. During alarm conditions, when the voltage on the Notification Appliance Circuit (NAC) is as shown, the diode conducts to allow power to light or sounder.
What is a NAC circuit in a fire alarm system?
NAC is an acronym which stands for “Notification Appliance Circuit”. ... The circuit connects the power source of the building or residence to the notification appliances such as horns and strobes.
How does a signaling line circuit work?
The Signaling Line Circuit (SLC) carries signals both to and from the panel; it uses data to carry the signals out from the panel to field devices, and data to carry the signals back from the field devices to the panel. The SLC also provides a small amount of power to operate the field devices.
How do I test my fire alarm control panel?
https://www.youtube.com/watch?v=cMznY7rPOWI
What devices are on a NAC circuit?
In the Notification Appliance Circuit (NAC), conventional fire horns, bells, strobes, chimes, and speakers, all have the Notification Appliance Riser Circuit Wiring in common. This circuit, under normal circumstances, is in either one of two different conditions: Supervision or Alarm.
Is the fire panel connected to the alarm system?
How Do Fire Alarm Systems Detect a Fire? The way a fire alarm system detects a fire is through its initiating devices, discussed above. The fire alarm panel is connected to the system's initiating devices through either 2- or 4-wire circuits.Aug 7, 2020
What is a NAC booster panel?
The booster contains all of the necessary circuits to monitor and charge batteries, control and supervise four Class B or two Class A Notification Appliance Circuits (NACs) and monitor two controlling inputs from external sources.
Does a fire alarm panel need a dedicated circuit?
The fire alarm control panel must receive its power from a dedicated branch circuit. The circuit cannot be used for lights, receptacles, or any type of appliances. The circuit must be mechanically protected: meaning it has to be provided with an automatic “disconnecting means” (commonly called a “circuit breaker”).